79621973 has 2 divisors, whose sum is σ = 79621974. Its totient is φ = 79621972.

The previous prime is 79621963. The next prime is 79622051. The reversal of 79621973 is 37912697.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78978769 + 643204 = 8887^2 + 802^2 .

It is an emirp because it is prime and its reverse (37912697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79621973 - 2¹⁰ = 79620949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79621963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39810986 + 39810987.

It is an arithmetic number, because the mean of its divisors is an integer number (39810987).

Almost surely, 2^79621973 is an apocalyptic number.

It is an amenable number.

79621973 is a deficient number, since it is larger than the sum of its proper divisors (1).

79621973 is an equidigital number, since it uses as much as digits as its factorization.

79621973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 79621973 is about 8923.1145347351. The cubic root of 79621973 is about 430.2071707674.

The spelling of 79621973 in words is "seventy-nine million, six hundred twenty-one thousand, nine hundred seventy-three".